My 2012 diesel forester has steering warning light and power steering does not work. I has 105000 miles and was fine until parked overnight. Any help gratefully received. I think it has electric steering. Thanks 

It happened to me once, about 4 years ago.

One morning there was no power steering and some light (don't remember what) on dash.

Turned the engine OFF, then back ON and no problems.

I never fixed anything, never even looked at anything.

 

And it never done it again since.

 

I now believe in japanese gremlins.